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annotate include/gui/widgets/graph.h @ 238:d2b7e974221e

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CI/linux: install glib
author Paper <paper@paper.us.eu.org>
date Fri, 19 Jan 2024 11:17:42 -0500
parents 45a0967485f1
children 862d0d8619f6
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1 #ifndef __gui__widgets__graph_h
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2 #define __gui__widgets__graph_h
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4 /* This class is defined as a template, so that means everything gets defined here as well :) */
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6 #include <QWidget>
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7 #include <QDebug>
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8 #include <QSize>
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9 #include <QPaintEvent>
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10 #include <QSize>
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11 #include <QRect>
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12 #include <QPainter>
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13 #include <QPainterPath>
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14 #include <QPen>
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15 #include <algorithm>
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16 #include <unordered_map>
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18 template<typename T>
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19 class Graph final : public QWidget {
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20 public:
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21 Graph(QWidget* parent = nullptr) : QWidget(parent) {};
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22 void AddItem(T key, unsigned long val) { map[key] = val; update(); updateGeometry(); };
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23 void Clear() { map.clear(); update(); updateGeometry(); };
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25 protected:
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26 std::unordered_map<T, unsigned long> map = {};
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27
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28 QSize minimumSizeHint() const override {
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29 QFontMetrics metric(font());
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30 /* wtf?... */
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31 return QSize(100, metric.height() * map.size() + (2 * (map.size() - 2)));
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32 }
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34 /* helper functions */
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35 inline unsigned long GetTotal() {
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36 unsigned long count = 0;
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38 for (const auto& item : map)
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39 count += item.second;
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41 return count;
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42 }
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43
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44 inline unsigned long GetTextWidth() {
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45 unsigned long ret = 0;
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46 QFontMetrics metric(font());
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48 for (const auto& item : map) {
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49 unsigned long width = metric.horizontalAdvance(QString::number(item.first), -1);
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50 if (width > ret)
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51 ret = width;
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52 }
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54 return ret;
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55 }
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57 void paintEvent(QPaintEvent* event) override {
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58 static constexpr int HORIZ_SPACING = 5;
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59 static constexpr int VERT_SPACING = 2;
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61 /* these are retrieved from the QPaintEvent */
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62 const QRect rect = event->rect();
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63 const int width = event->rect().width();
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64 const int x = rect.x();
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65 int y = rect.y();
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67 /* these are calculated from font metrics and such */
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68 const int total = GetTotal();
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69 const int text_width = GetTextWidth() + 10;
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70 const int each_height = QFontMetrics(font()).height();
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72 /* now we do the actual painting */
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73 QPainter painter(this);
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75 for (const auto& [key, value] : map) {
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76 painter.drawText(QRect(x, y, text_width, each_height), Qt::AlignVCenter, QString::number(key));
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78 /* only draw this if we actually have any data */
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79 if (total) {
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80 QPainterPath path;
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81 path.addRect(x + text_width + HORIZ_SPACING, y, (static_cast<double>(value)/total) * (width - text_width - HORIZ_SPACING), each_height);
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82 painter.fillPath(path, Qt::darkBlue);
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83 painter.drawPath(path);
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84 }
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86 y += each_height + VERT_SPACING;
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87 }
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88 }
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89 };
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91 #endif // __gui__widgets__graph_h